My wife and I purchased a new home in 2019, and moved to that home in November 2019. We did not sell the old home until March 2020 - it was vacant between November 2019 and March 2020. The combined principal of the two houses is over $750k. My question is how to treat the mortgage interest and whether we need to indicate anything about the change of our primary residence in November (note: both houses are in the same town).
